Coordinated Quiet Periods for Wireless Interference Detection
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Solution Overview
Problem
In wireless communication systems, overlapping coverage areas between base stations can lead to interference with incumbent users, as existing technologies lack efficient methods for coordinated sensing to identify and mitigate such interference without disrupting service quality.
Innovation Solution
The method involves identifying and coordinating 'quiet periods' between base stations to perform non-overlapping sensing, where one base station performs 'in-band' sensing during its quiet periods and a coordinate device performs 'out-band' sensing for adjacent base stations, helping to detect and mitigate interference by switching frequencies if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If base stations perform sensing activities to identify incumbent users, then interference mitigation capability is improved, but service quality and coverage continuity deteriorate due to transmission interruptions
Solution Approach 1:
The patent implements periodic sensing activities through defined quiet periods where base stations temporarily suspend transmissions at scheduled intervals. This allows incumbent user detection while maintaining regular service resumption, balancing interference mitigation with service continuity.
Solution Approach 2:
The patent establishes quiet periods in advance where base stations proactively suspend transmissions before potential interference occurs to incumbent users. This preliminary action enables detection and frequency switching before interference degrades service quality.
2Measurement precision
If multiple base stations perform independent sensing, then individual base station sensing capability is improved, but system-wide interference detection deteriorates due to overlapping quiet periods
Solution Approach 1:
The patent merges sensing activities of multiple base stations by coordinating their quiet periods to be non-overlapping in time. This combination approach ensures comprehensive system-wide interference detection while preventing false negatives that would result from simultaneous sensing attempts.
Solution Approach 2:
The patent dynamically assigns different time slots for quiet periods among multiple base stations based on their geographic locations and coverage areas. This dynamic coordination optimizes sensing coverage across the entire network while eliminating temporal overlaps that reduce detection accuracy.
3Reliability
If base stations frequently switch frequencies to avoid incumbent users, then interference mitigation is improved, but system stability and connection reliability deteriorate
Solution Approach 1:
The patent performs preliminary frequency switching during quiet periods before incumbent user interference occurs. By proactively changing frequencies in advance, the system prevents interference while maintaining stable connections during active transmission periods.
Solution Approach 2:
The patent implements periodic frequency switching only during scheduled quiet periods rather than continuously. This periodic approach maintains system stability during service periods while still providing regular opportunities to mitigate interference through frequency changes.
Data Source
AI summary
A first base station is associated with a first quiet period, and a second base station is associated with a second quiet period. The quiet periods are coordinated so that an amount of overlap between the quiet periods is acceptable. For example, the quiet periods could be coordinated so that no overlap exists between the quiet periods. During the first quiet period, the first base station and/or an associated device (such as a CPE served by the first base station) performs in-band sensing to detect wireless devices that use a first frequency or channel also used by the first base station. During the second quiet period, the first base station and/or a coordinate device (such as a CPE served by the first base station and assisting the second base station) performs out-band sensing to detect wireless devices that use a second frequency or channel also used by the second base station.